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| author | Simon Howard | 2006-05-03 19:23:54 +0000 |
|---|---|---|
| committer | Simon Howard | 2006-05-03 19:23:54 +0000 |
| commit | cbd744280545a38e62ecc0290a1312b3aeff9ae0 (patch) | |
| tree | 7ac58e309b23e8ee7d551603572321c8037e75a8 /src/r_main.c | |
| parent | a9684aecd9e8f292ac90a404b3f854df03dfd119 (diff) | |
| download | chocolate-doom-cbd744280545a38e62ecc0290a1312b3aeff9ae0.tar.gz chocolate-doom-cbd744280545a38e62ecc0290a1312b3aeff9ae0.tar.bz2 chocolate-doom-cbd744280545a38e62ecc0290a1312b3aeff9ae0.zip | |
Handle divide by zero in R_PointToDist: fixes crash in udm1.wad
Subversion-branch: /trunk/chocolate-doom
Subversion-revision: 474
Diffstat (limited to 'src/r_main.c')
| -rw-r--r-- | src/r_main.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/src/r_main.c b/src/r_main.c index 3b710a14..bde0f596 100644 --- a/src/r_main.c +++ b/src/r_main.c @@ -1,7 +1,7 @@ // Emacs style mode select -*- C++ -*- //----------------------------------------------------------------------------- // -// $Id: r_main.c 445 2006-03-27 22:56:14Z fraggle $ +// $Id: r_main.c 474 2006-05-03 19:23:54Z fraggle $ // // Copyright(C) 1993-1996 Id Software, Inc. // Copyright(C) 2005 Simon Howard @@ -49,7 +49,7 @@ //----------------------------------------------------------------------------- -static const char rcsid[] = "$Id: r_main.c 445 2006-03-27 22:56:14Z fraggle $"; +static const char rcsid[] = "$Id: r_main.c 474 2006-05-03 19:23:54Z fraggle $"; @@ -423,6 +423,7 @@ R_PointToDist fixed_t dy; fixed_t temp; fixed_t dist; + fixed_t frac; dx = abs(x - viewx); dy = abs(y - viewy); @@ -433,8 +434,19 @@ R_PointToDist dx = dy; dy = temp; } + + // Fix crashes in udm1.wad + + if (dx != 0) + { + frac = FixedDiv(dy, dx); + } + else + { + frac = 0; + } - angle = (tantoangle[ FixedDiv(dy,dx)>>DBITS ]+ANG90) >> ANGLETOFINESHIFT; + angle = (tantoangle[frac>>DBITS]+ANG90) >> ANGLETOFINESHIFT; // use as cosine dist = FixedDiv (dx, finesine[angle] ); |